Kirigami project: lay down low-poly buildings to paper
I'm not entirely sure I understood what you have in mind, but your description really made me think of the Export Paper Model add-on:

The add-on must be enabled (Edit > Preferences > Add-ons > Export Paper Model > ✔)



Create your mesh (or meshes) the way you'd normally do it. Blender 2.8x uses real-world measures by default: you can check in the properties menu (N) that the dimensions are the correct ones for your project (you can work on the model "cm" scale, or keep in mind a ratio, e.g. 1:125, and work at the real-world "m" scale, just make sure you then set the factor in the Paper Model add-on)



You can also use the Measure tool



Once you're happy with your mesh, you can use (N menu) > Paper > Export Paper Model. This will create a PDF with cut-and-fold paper model with the correct real world measures